Some rows of the field in the photograph contain cotton plants (Gossypium sp) that are genetically engineered to produce a toxin from the bacterium Bacillus thuringiensis (Bt). Bt kills insects that...

A bark scorpion (Centroides sp., green in the photograph) is pictured in an oval of ultraviolet light (purple in the photograph), demonstrating a unique method for studying scorpions in their native...